I heard yall like ADBV blow tests
- Thread starter Hatsuwr
- Start date
That's with air pressure. At what PSI? As a filter sits with oil in it with no pressure I'm sure it would be a different outcome.
It leaks at all pressures I tested, even very low ones. I turned it up a bit so it would be more apparent for the video, but increased pressure (up to a point) should make this type of ADBV seal better, if anything.
It leaks with air pressure.
How about use oil?
How about use oil?
It will leak with either, especially considering the rate you see there.
Thanks for sharing.
Have you tested any in the past that do not leak?
Have you tested any in the past that do not leak?
PSI is a bit hard to say, since my regulator lowers flow rate when the pressure is lowered, so if there was a big enough leak in the ADBV, pretty much no internal pressure could build with a lower regulator pressure.
That said, I went ahead and tested them all by applying 13 psi for 5 seconds, letting it leak for 3 seconds, then removing the nozzle to see if pressure remained.
1 of 4 Ultras (XG) failed.
2 of 3 Titaniums (FS) failed.
0 of 3 Synthetic Endurances (FE) failed.
I repeated the test at 30 psi and at the lowest setting I could achieve, which didn't register on the gauge. The results were the same.
The one Titanium that passed was the older style with holes in the center core. The other two had the newer louvers. One of the two newer ones was sort of on the border of pass/fail, but it only had the tiniest amount of pressure remaining.
Air pressure...flashlight and burning...O MY.....
*pearl-clutching intensifies*
It appears that every filter you tested fails to hold air in the anti drain back valve.
While interesting, you’ve not determined the correlation between holding air, and holding oil, so as yet, I don’t see the relevance of your test.
What a filter needs to be able to do, is prevent oil from draining back.
Where practicable I inspect all filters pre purchase, but the blow test, a bridge too far for me. Worst case, "perhaps" some brief start up rattle, Imo, not engine life critical nor is it filter efficiency related.
Cool academic exercise, I guess.
Cool academic exercise, I guess.
Only 3 of 10 have been confirmed to leak so far, although I suppose 'only' is a strange word choice in that context...
This is a rubber-metal interface. If air leaks at this rate, oil will absolutely leak too. With how this style of ADBV works, higher pressure should improve the sealing (in a functional one).
Nope, definitely going to have more effects than that. You will have increased startup wear from delayed lubrication, greater bypassing on startup, and increased startup contamination.
ADBVs exist for a reason.
The ADBV has nothing to do with the filter bypass valve operation.
It does when it allows oil to drain back, emptying the oil passages and presenting less resistance on startup.
Maybe in a rare case where someone has the gas pedal to the floor when a doing a cold start-up in cold weather ... but who does that? PS - I actually saw someone (drunk college student) do that once on an old pickup truck in the middle of winter, and I was waiting for the engine to blow before my eyes, lol. Besides, the oil filter will not be bone dry in any case, except if installed new without pre-filling the filter with oil.
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I typically do the ADBV "blow-test" on the filters I put on my Tacoma which as the oil filter mounted vertical with the base down. If there's no ADBV leakage detected with that low level of pressure, they have never leaked down on me inb that mounting setup. I need to punch a hole in the top of the filter to make them drain out before an oil change. I even had one that didn't drain out even with a hole in the dome end of the filter - they typically do. So now I blow ~5 PSI into the hole punched in the dome to make the oil evacuate the filter before removing it.
The specifics will vary vehicle to vehicle, but drained oil can cause a filter that doesn't bypass on startup to begin to do so, and it WILL cause a filter that does bypass on startup to do so more. Bypassing happens when the pressure differential across the bypass valve exceeds the bypass pressure. Pushing air through the oil passages is easier than pushing oil, and therefore the pressure on the outlet of the filter will be lower when pushing air. This lower pressure on the outlet means that the pressure differential across the bypass valve will be higher while the oil passages are being refilled compared to what it would be if they were already filled, which causes the increased bypassing that I described.
The only time a filter bypass valve can open upon a dry start-up (talking about a bone dry filter here or partially drained galleries & filter) vs not doing so with the filter and oiling system 100% filled with oil, is if the oil pump is putting out enough flow through the filter at the low start-up RPM before the back pressure is achieved back to the pump to make the pump hit pressure relief and regulate flow. Even when that does happen, it's a very short bypass event at the filter. IMO, not many engines are going to do that unless the oil is very cold and thick at start-up since filter dP is highly dependent on both oil flow and viscosity. Oil getting cold and thick enough will even cause filters to bypass some on cold start-ups even if no oil leaks out of the system from a bad ADBV and it remains 100% full. Simply increasing engine RPM above idle shortly after a cold start if the oil is cold enough can cause the filter to bypass - so it's always wise to keep the RPM down until the oil warms up a bit.
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